<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
</head>
<body>
    <div id="root">
        <div @click="handleClick">
            {{message}}
        </div>
        <item></item>
    </div>
      
    <script>
        Vue.component('item', {
            template: '<div>hello world</div>'
        })

        var vm = new Vue({
            el: '#root',
            data: {
                message: 'hello world'
            },
            methods: {
                handleClick: function() {
                    alert(1111)
                }
            },
        })
    </script>
</body>
</html>